Question

早上好，
我在mysql中遇到这个问题我有一张这样的桌子：

表1

AccessDate__UserCode__AnalisisName____AnalisisResult

2012-01-01____1____________a1______________10  
2012-01-01____1____________a2______________15  
2012-01-01____1____________a3______________12  

2014-03-01____1____________a1______________12  
2014-03-01____1____________a3______________13  

2012-01-01____2____________a1______________14  
2012-01-01____2____________a2______________15  
2012-01-01____2____________a3______________20  

2013-03-01____2____________a1______________3  

2012-01-01____3____________a1______________2  
2012-01-01____3____________a2______________1  

2014-01-01____3____________a1______________10

我希望将数据复制到另一个表中，在同一记录中设置具有相同AccessDate和UserCode的所有记录，并使用AnalisisName值作为列指针。
我的意思是：

表2

AccessDate___UserCode___a1__a2__a3  

2012-01-01_____1________10__15_12  
2014-03-01_____1________12___-_13  
2012-01-01_____2________14__15_20  
2013-03-01_____2_________3___-_-  
2012-01-01_____3_________2___1_-  
2014-01-01_____3________10___-_-

非常感谢你的帮助!!
最好的问候保罗

Answer 1

创建新表：

CREATE TABLE newtable
(AccessDate date NOT NULL,
UserCode integer NOT NULL,
a1 integer,
a2 integer,
a3 integer,
CONSTRAINT newtable_pk PRIMARY KEY (AccessDate)
);

插入a1记录：

INSERT INTO newtable
(AccessDate, UserCode, a1)
SELECT AccessDate, UserCode, AnalisisResult
FROM table1
WHERE AnalisisName='a1';

插入a2记录：

INSERT INTO newtable
(AccessDate, UserCode, a2)
SELECT AccessDate, UserCode, AnalisisResult
FROM table1
WHERE AnalisisName='a2';

插入a3记录：

INSERT INTO newtable
(AccessDate, UserCode, a3)
SELECT AccessDate, UserCode, AnalisisResult
FROM table1
WHERE AnalisisName='a3';

将包含2个等于table1数据的所有记录复制到table2中的一个记录

1 个答案: